Having same problem on chrome and edg
I just get this screen and doesnt do anything, can click grind but nothing happends
https://gyazo.com/16054ec24c465fce257582a743d2239c
Worth a shot? You should be able to just delete itch cookies by searching "third party cookies" in your chrome settings.
This will also delete any cookies being used by other games on itch, but it shouldn't be a problem if you didn't have cookies on before now. If that doesn't work then I guess I gotta keep searching for a solution!